Draft control damper structure



Jan. 2 6, 1943. H. WEYENBERG DRAFT CONTROL DAMPER STRUCTURE Filed Oct. 20, 1941 (Ittorneg Patented Jan. 26, i943 RMT CGN'ERGL DAD/EPEE STRUCTURE Henry Weyenberg, Holland, Mich., assignor to 'Holland 'Furnace Company, Holland, Mich., a

cor-poration application Gctober 20, 1941, 'Serial No. '415,733

V6 Ciaims.

My present invention relates to improvements in draft control damper structures in which a pivoted shutter is actuated by the air draft in a smoke flue or chimney of a furnace or the like for controlling the amount of air drawn into the furnace or lkceffice; and the objects of my improvement are: first, to provide a draft control damper structure that will be simple and not liable ito disorder; second, to provide a draft control .damper structure that will be inexpensive to manufacture; third, to provide a draft control damper structure that will be automatic in operation; fourth, to provide a draft control damper structure that will automatically control the amount of air drawn into a furnace by the intensity of the draft in the smoke flue extending from the furnace; fth, to provide a draft control damper structure that will be extremely sensitive to variations of draft and in its operation; sixth, to provide a draft control damper structure that can be readily adjusted to the required amount of air drawn into the furnace.

I attain these named objects and such other objects as may appear from a perusal of the following description and structure shown in the accompanying drawing, in which- Figure `1 is a front elevation View of my draft control damper structure.

Figure 2, a sectional View of the draft control damper structure taken on a plane looking in the direction the arrow indicates on line V-V, of Figure 1.

Figure 3, an enlarged fragmentary view of the draft control damper structure in which is illustrated the pivot arrangement by which the damper shutter is hung.

'Throughout the views of Vthe accompanying drawing, similar parts of my draft control damper structure are designated and referred to by similar numerals, and referring thereto numeral I, designates the bezel of my draft control damper structure, having hung therein damper shutter 2 by inwardly and downwardly bent brackets 3 at two sides of the bezel, each of said brackets having a hole il into which extends tongues 5 projecting from two sides of the shutter 2, the said 'tongues each having a level upper edge and a lower edge 6 inclined upward from the shutter body which has counteror balancing weights l, 8 and 9 screw threaded on threaded stud I secured to the shutter 2 above the upper line of the tongues and in spaced apart relation thereto. The said shutter 2 having a cup like depression II extending from its back side and around the stud I0, whereby the Weights l and 8 may be adjusted on the stud I?! `to the position Vdesignated by numeral 1 showing the weights in `broken lines, Weight 9 is screw threaded on stud II! at the front or exposed side of the shutter 2 and is locked thereon by nut I2. The `bezel I, comprises an annular band like ring -I3 in which is hung and pivoted the damper shut-ter 2, and by which the draft control damper structure is secured to the flue It extending from the smoke flue of the furnace, by the ring I-3 'being shoved into the said flue I4 and secured therein as by riveting or any other convenient orleans. At the front of the bezel is outwardly extending annular flange I5 whereby any 'crack Vlike opening between the inner periphery of the ue il! `and the bezel ring is closed. Numeral I5 designates a stop lug formed on the bezel ring I3 below the lower edge of the damper shutter and whereby the damper shutter 2 is prevented from swinging outward of the bezel at its bottom. Below one of the brackets 3 is a second stop lug I1 formed on the ring I 3' and whereby the damper shutter is prevented from swinging inward of the flue I l beyond a horizontal plane.

In the application of my draft control damper structure to a heating furnace having a flue for conducting smoke and other products of combustion to `a chimney or stack, one of the sections of the said ue is usually a T with a branch having an open end in which the bezel ring like band I3 is shoved and there fastened as by riveting or any other suitable means and with the outwardly extending annular flange I5 against the end of the flue, and having assembled the structure previous to shoving it into the said flue end, I yadjust the counterbalance weights 'l and -8 longitudinally of the screw threaded stud III by turning the Weights on the threads of the stud, until a balance is made between the draft force in the said ue and the damper shutter 2 as weighted by the counterbalance weights l and 8 that are adjusted for a predetermined draft force which is greater during high velocity winds and when there'is a greater differential in temperature betweenthe tem erature at the furnace and the top of the chimney, this draft force varies with variation in wind velocity and the said differential of temperature, therefore a draft control damper should be very sensitive to slight variation ,in draft force which sensitivity is present in my draft control damper structure because of the damper shutters rocking movement in the holes 4 of the bracket 3 and the knife like lower incline edges of the tongues do 5 offer no frictional resistance to the movement of the damper shutter either while it is opening or closing, and the incline edges of the tongues 5 maintaining the said damper shutter in concentric relation with the bezel ring like band I3 with an annular clearance between the said shutter and ring.

Having described my present invention consisting of a draft control damper structure, I claim:

l. In a draft control damper structure, the combination of a bezel ring having an outwardly extending annular flange at its front and a pair of inwardly and downwardly bent brackets in spaced apart relation to each other above the axis of the bezel ring, each bracket having a hole extending therethrough, a damper shutter having a pair of tongues in horizontally spaced apart relation to each other above a horizontal line extending through the center of the shutter and extending through the said holes of the said brackets and each having a lower edge inclined upwardly away from the shutter and engaging the lower side of the said holes, a pocket extending into the shutter from the back thereof and having a screw threaded stud extending from said pocket and having screwed thereon a plurality of weights for balancing the shutter, a stop extending inward of the bezel ring for limiting the swing of the shutter outward from the bezel ring and a second stop carried by the bezel ring for limiting the swing of the shutter inward of the bezel ring and flue secured thereto.

2. In a draft control damper structure, the combination of a bezel ring having an outwardly extending annular flange at its front and a pair of inwardly and downwardly bent brackets in spaced apart relation to each other above the axis of the bezel ring. each bracket having a hole eX- tending therethrough, a damper shutter having a pair of tongues in horizontally spaced apart relation to each other above a horizontal line extending through the center of the shutter and extending through the said holes of the said brackets and each having a lower edge inclined upwardly away from the shutter and engaging the lower side o one of said holes, a pocket extending into the shutter from the back thereof and having a screw threaded stud extending from said pocket and having screwed thereon a plurality of weights for balancing the shutter, a stop extending inward of the bezel ring for limiting the swing of the shutter outward from the bezel ring and a second stop carried by the bezel ring for limiting the swing of the shutter inward of the bezel ring and flue secured thereto.

3. In a draft control damper structure, the combination of a bezel ring having an outwardly extending annular flange at its front and a pair of inwardly and downwardly bent brackets in spaced apart relation to each other above the axis of the bezel ring, each bracket having a hole extending therethrough, a damper shutter having a pair of tongues in horizontally spaced apart relation to each other above a horizontal line extending through the center of the shutter and extending through the said holes of the said brackets and each having a lower edge inclined upwardly away from the shutter and engaging the lower side of one of said holes, a plurality of weights carried by the shutter for balancing the shutter, a stop extending inward of the bezel ring for limiting the swing of the shutter outward from the bezel ring and a second stop carried by the bezel ring for limiting the swing of the shutter inward of the bezel ring and flue secured thereto.

4. In a draft control damper structure, the combination of a' bezel ring having an outwardly extending annular flange at its front and a pair of inwardly and downwardly bent brackets in spaced apart relation to each other above the axis of the bezel ring, each bracket having a hole extending therethrough, a damper shutter having a pair of tongues in horizontally spaced apart relation to each other above a horizontal line extending through the center of the shutter and extending through the said holes of the said brackets and each having a lower edge inclined upwardly away from the shutter and engaging the lower side of one of said holes, a plurality of weights for balancing the shutter, a stop for limiting the swing cf the shutter outward from the bezel ring and a second stop carried by the bezel ring for limiting the swing of the shutter inward of the bezel ring and flue secured thereto.

5. In a draft control damper structure, the combination of a bezel ring having an outwardly extending annular flange at its front and a pair of brackets in horizontally spaced apart relation to each other above the axis of the bezel ring, each bracket having a hole extending therethrough, a damper shutter having a pair of tongues in horizontally spaced apart relation to each other above a horizontal line extending through the center of the shutter and extending through the said holes of the said brackets and each tongue having a lower edge inclined upwardly away from the shutter and engaging the lower side of the said holes, a pocket extending into the shutter from the back thereof and having a screw threaded stud extending from said pocket and having screwed i thereon a plurality of adjustable weights for balancing the shutter, a stop extending inward of the bezel ring for limiting the swing of the shutter outward from the bezel ring and a second stop carried by the bezel ring for limiting the swing o f the shutter inward of the bezel ring and flue secured thereto.

6. In a draft control damper structure, the combination of a bezel ring having a pair of opposed brackets in spaced apart relation to each other within the said ring above the axis of the ring, each bracket having a hole extending therethrough, a damper shutter having a pair of tongues in horizontally spaced apart relation to each other above a horizontal line extending through the center of the shutter and extending through the said holes of the said brackets and each having a lower edgeinclined upwardly away from the shutter and engaging the lower side of the holes in said brackets.

HENRY WEYENBERG. 

